13 DPO, negative test

Hey ladies. I’m currently 13 DPO and tested yesterday and got a BFN. Today I’ve had cramping but when I wiped thrice there was very light blood on the toilet paper but nothing in my undies. Put in a pad just Incase and this is all I got for the entire day?

Is it too late to be implantation and do you think that I’m out this month coz I got a negative yesterday?